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                            <h1 class="post-title">ndk编译ffmpeg</h1>
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                        <date class="post-meta meta-date">
                            2019年1月14日
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                            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span> 阅读</span></span>
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                            <p>最近在努力学习音视频相关东西,以备未来不时之需</p>
<p>在音视频处理领域有一个绕不过去的著名项目就是<code>FFmpeg</code>,这个项目基于 GPL 开源协议,<a href="http://www.ffmpeg.org">官网</a></p>
<p>最新版本目前我在 mac 上无法编译,会报错</p>
<p>使用的总体环境如下:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-txt" data-lang="txt">Macos: 10.13.6 (17G65)
ffmpeg: 3.3.6
ndk: 15.2.4203891
</code></pre></div><h2 id="引用外部源码尝试失败">引用外部源码(尝试失败)</h2>
<p>初次尝试的时候,希望可以通过 CMakeLists 中配置头文件和库的方式,直接引用,发现可能需要拷贝所有源代码到项目中,但这样需要 copy 的东西很多,对于真实的项目来说也许可行,但 demo 项目就太复杂了,而且不方便今后的使用</p>
<h2 id="交叉编译-so">交叉编译 so</h2>
<p>这里有一个坑,就是 ndk 版本不能太低,因为之前使用过 ijkplayer,那个项目要求 11d 还是 11e 的 ndk 版本,我这次想直接用这个 ndk 版本,过程中会报很多错误,具体原因没有深究</p>
<p>然后使用我 android sdk 中带的 ndk 版本果断成功</p>
<p>这个是我的 ndk 版本,截至当前最新版本应该是 18.X</p>
<p>版本号在 ndk 中查看 propertis 文件可以看见</p>
<p>另一个叫法是 android-ndk-r15c</p>
<pre><code class="language-properties" data-lang="properties">Pkg.Desc = Android NDK
Pkg.Revision = 15.2.4203891
</code></pre><p>ffmpeg 版本:我开始是下载的最新版本 4.1 版 ,结果编译不通过,在 udp.c 中报错了,通过网络搜索到一个原因,ffmpeg <a href="https://blog.csdn.net/utilc/article/details/79142662">版本太高了</a></p>
<p>通过下载了一个 ffmpeg-3.3.6 解决</p>
<p>另外,亲测最新的 NDKr18 并不能编译 3.3.6 会报一个</p>
<pre><code class="language-log" data-lang="log">/Users/caijinglong/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc is unable to create an executable file.
C compiler test failed.

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file &quot;config.log&quot; produced by configure as this will help
</code></pre><p>换成 r15c 后分分钟钟成功</p>
<h3 id="结论">结论</h3>
<p>在 mac 下,使用 ndk 15.2.4203891(r15c) + ffmpeg 3.3.6 一定可以成功,其他的环境不保证</p>
<p><a href="https://dl.google.com/android/repository/android-ndk-r15c-darwin-x86_64.zip">ndk 下载</a></p>
<p><a href="https://ffmpeg.org/releases/ffmpeg-3.3.6.tar.bz2">ffmpeg 下载</a></p>
<h2 id="编译过程">编译过程</h2>
<h3 id="脚本">脚本</h3>
<p>使用的是楼上同学的脚本修改 ndk 路径</p>
<p>这里要注意 TMPDIR 对应的这个文件夹请提前建立好</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#75715e">#!/bin/bash
</span><span style="color:#75715e"></span>export TMPDIR<span style="color:#f92672">=</span>/Users/cai/code/c/ffmpeg/tempdir
NDK<span style="color:#f92672">=</span>/Users/cai/Library/Android/sdk/ndk-bundle

TOOLCHAIN<span style="color:#f92672">=</span>$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64

NDK_VERSION<span style="color:#f92672">=</span>android-14

PLATFORM<span style="color:#f92672">=</span>$NDK/platforms/$NDK_VERSION/arch-arm

echo <span style="color:#e6db74">&#34;NDK=</span>$NDK<span style="color:#e6db74"> NDK_VERSION=</span>$NDK_VERSION<span style="color:#e6db74">&#34;</span>

<span style="color:#75715e"># darwin linux</span>
<span style="color:#66d9ef">function</span> build_one <span style="color:#f92672">{</span>
./configure <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--target-os<span style="color:#f92672">=</span>linux <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--arch<span style="color:#f92672">=</span>$ARCH <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--prefix<span style="color:#f92672">=</span>$PREFIX <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--enable-shared <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-static <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-doc <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-ffmpeg <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-ffplay <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-ffprobe <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-ffserver <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-doc <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--disable-symver <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--enable-cross-compile <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--cross-prefix<span style="color:#f92672">=</span>$CROSS_COMPILE <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--sysroot<span style="color:#f92672">=</span>$SYSROOT <span style="color:#ae81ff">\
</span><span style="color:#ae81ff"></span>--extra-cflags<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;-fpic&#34;</span>

$ADDITIONAL_CONFIGURE_FLAG

make clean
make -j8
make install
<span style="color:#f92672">}</span>

ARCH<span style="color:#f92672">=</span>arm
CPU<span style="color:#f92672">=</span>arm
PREFIX<span style="color:#f92672">=</span><span style="color:#66d9ef">$(</span>pwd<span style="color:#66d9ef">)</span>/android/$CPU
TOOLCHAIN<span style="color:#f92672">=</span>$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
CROSS_COMPILE<span style="color:#f92672">=</span>$TOOLCHAIN/bin/arm-linux-androideabi-
SYSROOT<span style="color:#f92672">=</span>$NDK/platforms/$NDK_VERSION/arch-$ARCH

echo <span style="color:#e6db74">&#34;PREFIX=</span><span style="color:#e6db74">${</span>PREFIX<span style="color:#e6db74">}</span><span style="color:#e6db74">&#34;</span>
echo <span style="color:#e6db74">&#34;TOOLCHAIN=</span><span style="color:#e6db74">${</span>TOOLCHAIN<span style="color:#e6db74">}</span><span style="color:#e6db74">&#34;</span>
echo <span style="color:#e6db74">&#34;CROSS_COMPILE=</span><span style="color:#e6db74">${</span>CROSS_COMPILE<span style="color:#e6db74">}</span><span style="color:#e6db74">&#34;</span>
echo <span style="color:#e6db74">&#34;SYSROOT=</span><span style="color:#e6db74">${</span>SYSROOT<span style="color:#e6db74">}</span><span style="color:#e6db74">&#34;</span>

echo <span style="color:#e6db74">&#34;******************************&#34;</span>

build_one
</code></pre></div><h3 id="修改-ffmpeg-配置源码">修改 ffmpeg 配置源码</h3>
<p>使用 vi/文本编辑器 之类的东西打开 ffmpeg/configure 修改</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#75715e">#SLIBNAME_WITH_MAJOR=&#39;$(SLIBNAME).$(LIBMAJOR)&#39;</span>
<span style="color:#75715e">#LIB_INSTALL_EXTRA_CMD=&#39;\$$(RANLIB) &#34;$(LIBDIR)/$(LIBNAME)&#34;&#39;</span>
<span style="color:#75715e">#SLIB_INSTALL_NAME=&#39;$(SLIBNAME_WITH_VERSION)&#39;</span>
<span style="color:#75715e">#SLIB_INSTALL_LINKS=&#39;$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)&#39;</span>

SLIBNAME_WITH_MAJOR<span style="color:#f92672">=</span><span style="color:#e6db74">&#39;$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)&#39;</span>
LIB_INSTALL_EXTRA_CMD<span style="color:#f92672">=</span><span style="color:#e6db74">&#39;\$$(RANLIB)&#34;$(LIBDIR)/$(LIBNAME)&#34;&#39;</span>
SLIB_INSTALL_NAME<span style="color:#f92672">=</span><span style="color:#e6db74">&#39;$(SLIBNAME_WITH_MAJOR)&#39;</span>
SLIB_INSTALL_LINKS<span style="color:#f92672">=</span><span style="color:#e6db74">&#39;\$(SLIBNAME)&#39;</span>
</code></pre></div><p>修改上面的为下面的</p>
<p>原始文件行为 3305~3308 行</p>
<h3 id="编译">编译</h3>
<p>使用<code>sh build_android.sh</code> 打包
也可以用 <code>chmod -x build_android.sh;./build_android.sh</code></p>
<p>然后等待完成就可以了</p>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190114163509.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190114163509.png"></p>
<p>我这里是这样的</p>
<h2 id="查看编译结果">查看编译结果</h2>
<p>我这里分别编译得到这样的结果</p>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190114163602.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190114163602.png"></p>
<p>我这里是分别编译了 arm/v7a/arm64 的 so 文件,你只需要修改 sh 文件,将 CPU 分别设置即可打包出对应的类型</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">arm <span style="color:#f92672">=</span>&gt; armeabi
armeabi-v7a <span style="color:#f92672">=</span>&gt; armeabi-v7a
arm64-v8a <span style="color:#f92672">=</span>&gt; arm64-v8a
</code></pre></div><p>修改这两个为对应的 cpu 类型即可</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">ARCH<span style="color:#f92672">=</span>arm
CPU<span style="color:#f92672">=</span>arm
</code></pre></div><p>其实,正常来说 只需要一个 armeabi-v7a 就可以了,因为我是用的 flutter,为了兼容更多的设备,最好是有且只有 v7a 的 so 即可</p>
<h2 id="后记">后记</h2>
<p>本篇是使用 mac 交叉编译出安卓可用的 so 库,下一篇会介绍如何将 so 置入</p>

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        <li><a href="/posts/flutter/android/finish-activity/">Finish FlutterActivity 源码解析</a></li>
        
        <li><a href="/posts/flutter/channel/flutter-channel2/">Flutter 原生通信 (二) - Android通知Flutter</a></li>
        
        <li><a href="/posts/flutter/channel/flutter-channel1/">Flutter 原生通信 (一) - flutter调用Android</a></li>
        
        <li><a href="/posts/flutter/so-about-1/">flutter android So库对齐</a></li>
        
        <li><a href="/posts/android/android-repo-confire/">android 依赖冲突</a></li>
        
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    <a href="http://www.kikt.top/tags/%E5%9F%8E%E5%B8%82/">城市</a>
    
    <a href="http://www.kikt.top/tags/%E5%A4%A7%E6%96%87%E4%BB%B6/">大文件</a>
    
    <a href="http://www.kikt.top/tags/%E5%B7%A5%E5%85%B7/">工具</a>
    
    <a href="http://www.kikt.top/tags/%E5%B7%B2%E6%9C%89%E9%A1%B9%E7%9B%AE/">已有项目</a>
    
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    <a href="http://www.kikt.top/tags/%E6%96%87%E6%A1%A3/">文档</a>
    
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    <a href="http://www.kikt.top/tags/%E7%82%B9%E5%87%BB/">点击</a>
    
    <a href="http://www.kikt.top/tags/%E7%84%A6%E7%82%B9/">焦点</a>
    
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    <a href="http://www.kikt.top/tags/%E7%8A%B6%E6%80%81%E7%AE%A1%E7%90%86/">状态管理</a>
    
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    <a href="http://www.kikt.top/tags/%E8%BF%87%E5%9C%BA%E5%8A%A8%E7%94%BB/">过场动画</a>
    
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